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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME        
Net income $ 570.0 $ 556.6 $ 1,240.2 $ 1,207.2
Commodity derivative instruments:        
Changes in fair value of cash flow hedges (73.7) (4.3) (74.9) 26.5
Reclassification of losses (gains) to net income 35.4 (20.2) (21.8) (81.3)
Interest rate derivative instruments:        
Changes in fair value of cash flow hedges (9.4) 0.0 (9.4) 0.0
Reclassification of losses to net income 9.2 8.7 18.4 17.4
Total cash flow hedges (38.5) (15.8) (87.7) (37.4)
Other 0.0 0.4 (0.1) 0.4
Total other comprehensive loss (38.5) (15.4) (87.8) (37.0)
Comprehensive income 531.5 541.2 1,152.4 1,170.2
Comprehensive income attributable to noncontrolling interests (11.5) (5.6) (20.5) (20.1)
Comprehensive income attributable to limited partners $ 520.0 $ 535.6 $ 1,131.9 $ 1,150.1